AI Wealth Truth (11): Why Trickle-Down Economics Never Worked

I. "Trickle-down economics" is one of the most influential economic policy ideas of the past 40 years. The logic sounds simple: cut taxes for the rich, and the rich will invest, start businesses, and create jobs. Wealth will "trickle down" like water from the top to the bottom. In the end, everyone benefits. This theory backed the tax-cut agendas of Reagan, George W. Bush, and Trump.

II. In 2020, LSE researchers David Hope and Julian Limberg published a study. They analyzed 50 years of data from 18 developed countries, from 1965 to 2015. They compared countries that enacted "tax cuts for the rich" with those that did not. What did they find?

III. Tax cuts for the rich do make the rich richer. Within five years after the tax cut, the income share of the top 1% rose significantly. That is predictable. If you cut their taxes, they have more money.

IV. But tax cuts have no significant effect on economic growth. Countries that implemented large tax cuts did not grow faster than others. The chain "tax cuts lead to investment lead to job creation" did not hold.

V. Tax cuts also do not reduce unemployment. In countries that cut taxes, unemployment did not fall significantly. After receiving tax cuts, the rich did not use that money to create jobs. They put it into financial markets, real estate, or simply saved it.

VI. Tax cuts have no positive effect on middle and lower incomes. Five, ten, and fifteen years after the tax cut, the income share of the middle and lower classes did not rise. Wealth did not "trickle down". It stayed at the top.

VII. This is not an isolated study. In a 2015 report, the International Monetary Fund (IMF) found: When the income of the richest 20% rises, growth actually slows. When the income of the poorest 20% rises, growth accelerates. Growth improves when wealth flows downward, not when it concentrates upward.

VIII. Why does trickle-down fail? First, the rich have a low marginal propensity to consume. If you give a poor person 1,000 yuan, they may spend 900, because they need things. If you give a rich person 1,000 yuan, they may spend only 100, because they already have everything. Consumption is the engine of the economy. When the rich spend less, the stimulus effect is weaker.

IX. Second, the rich's money flows into asset markets, not the real economy. When the rich have more money, they buy stocks, property, and art. These purchases bid up asset prices, but do not create jobs in the real economy. Money circulates within the financial system. It does not "trickle down" into workers' pockets.

X. Third, tax cuts reduce government revenue and squeeze public services. Less revenue means less spending on education, healthcare, and infrastructure. These public services matter far more to the middle and lower classes than to the rich. A tax cut is effectively a wealth transfer from the poor to the rich.

XI. Fourth, the rich's effective tax rate is already low. A large share of rich people's income comes from capital gains, taxed far below wages. Even if the nominal rate is high, the effective rate can be low. Warren Buffett once said his effective tax rate was lower than his secretary's. Tax cuts cut the nominal rate. The real effect is even smaller.

XII. Given the evidence is so clear, why has the "trickle-down" theory persisted for 40 years? Because it serves the interests of those who make policy. Policies are made by politicians. Politicians need campaign money. Campaign money comes from rich donors. The rich want tax cuts. Politicians provide a theoretical wrapper. "Trickle-down" is not economics. It is political rhetoric.

XIII. Economist John Kenneth Galbraith said back in 1982: "The trickle-down theory is that if you feed the horse enough oats, some will pass through to the road for the sparrows." That is the most accurate description of the theory.

XIV. The AI era makes this problem worse. AI returns are extremely concentrated in the hands of a few companies and individuals. If we keep using the logic "cut taxes at the top to promote innovation". The gains become even more concentrated, not more distributed. Because AI's marginal cost is near zero. It does not require hiring massive numbers of workers. The rich get richer, but jobs do not scale with that wealth.

XV. OpenAI is valued at more than $80 billion. How many employees does it have? Fewer than 1,000. A traditional company needs tens of thousands, even hundreds of thousands, to reach that valuation. AI companies can create enormous value with very few people. That value will not "trickle down" to the broad workforce.

XVI. Some say: AI will lower prices, and all consumers benefit. This is another version of the "trickle-down" logic. But if your job is replaced by AI, you become unemployed. Even if products are cheaper, you still cannot afford them. You need income first to benefit from low prices.

XVII. Others say: anyone can buy AI company stocks. Everyone can share AI's returns. But buying stocks takes money. If your wages barely cover living expenses, you have no surplus to invest. Stock market gains belong to those with surplus cash.

XVIII. Another version of "trickle-down" is: technological progress benefits everyone. Historically, that has been true. Cars, electricity, and the internet eventually reached the mass market. But the process takes decades, and countless people are left behind along the way. For the generation left behind, "eventually" is a cruel consolation.

XIX. More importantly: previous technological progress created vast numbers of jobs. Cars replaced carriages and created an entire automotive supply chain. AI may be different. It replaces cognitive labor, and the new jobs it creates may be few. "Eventually" may take a hundred years. Several generations in between may be losers.

XX. When you hear politicians say "tax cuts create jobs, and wealth will trickle down". Ask back: 40 years later, where is the trickle? Where is the IMF data? How do you explain the LSE study? Do not believe political rhetoric without evidence. Especially in the AI era, when wealth concentrates faster. "Trickle-down" will not happen. It never happened.